The March of Dimes is reporting that preterm birth rates in the United States dropped for the fifth consecutive year in 2011 to 11.7 percent, the lowest in a decade, giving thousands more babies a healthy start in life and saving billions in health and social costs. Four states - Vermont, Oregon, New Hampshire and Maine -- earned an "A" on the March of Dimes 2012 Premature Birth Report Card, but as a whole, the U.S. earned a "C." March of Dimes President Dr. Jennifer L. Howse attributes the improved rates to an expansion of successful programs and interventions. To see how your state did or to learn more on preterm birth visit www.marchofdimes.com/reportcard